curl --request POST \
  --url https://api.eflow.team/v1/networks/custom/creative \
  --header 'Content-Type: application/json' \
  --header 'X-Eflow-Api-Key: <api-key>' \
  --data '
{
  "network_offer_creative_ids": [
    10,
    20
  ],
  "network_affiliate_ids": [
    100,
    200
  ],
  "name": "Holiday Banner for Top Affiliates",
  "custom_setting_status": "active"
}
'

{
  "network_custom_creative_setting_id": 123,
  "network_id": 123,
  "network_offer_creative_ids": [
    123
  ],
  "network_affiliate_ids": [
    123
  ],
  "name": "<string>",
  "custom_setting_status": "active",
  "time_created": 123,
  "time_saved": 123,
  "relationship": {
    "affiliates": [
      {}
    ],
    "creative": {}
  }
}